
.my-keyboard{
    width: 100%;
    box-sizing: border-box;
    text-align: center;
    padding: 24px 0 46px 0px;
    border: none;
}

.my-keyboard .cheng-btns{
    width: 512px;
    display: flex;
    flex-direction: row;
    justify-content: flex-start;
    flex-wrap: wrap;
    margin-left: 50%;
    transform: translateX(-50%);
    border-bottom: 1px solid #ccc;
    border-right: 1px solid #ccc;
}

.my-keyboard .cheng-btns input:nth-child(10){
    padding-bottom: 14px;
    font-weight: 700;
}
.my-keyboard .btn-item{
    box-sizing: border-box;
    width: 170px;
    height: 70px;
    background: #FFF;
    outline: none;
    border: none;
    border-top:1px solid #ccc;
    border-left:1px solid #ccc; 
    font-size: 24px;
    color: #666666;
    cursor: pointer;
}
.my-keyboard .btn-item:active{
    background: #EADCF1;
}
.my-keyboard .btn-back{
    width: 170px;
    height: 70px;
    background: #FFF;
    border-top:1px solid #ccc;
    border-left:1px solid #ccc;  
    line-height: 70px;
    cursor: pointer;
}
.my-keyboard .btn-back:active{
     background: #EADCF1;
}
